Answer:
\[{{v}_{1}}=\frac{c}{{{\lambda
}_{1}}}=\frac{3\times {{10}^{8}}}{400\times {{10}^{-9}}}\]
\[=7.5\times {{10}^{14}}{{\sec
}^{-1}}or\,Hz\]
\[{{v}_{2}}=\frac{c}{{{\lambda
}_{2}}}=\frac{3\times {{10}^{8}}m{{s}^{-1}}}{750\times {{10}^{-9}}m}=4\times
{{10}^{14}}{{\sec }^{-1}}or\,Hz\]
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